[rules-users] Drools 5.5 divide by 0 exception
gboro54
gboro54 at gmail.com
Fri Nov 1 14:17:06 EDT 2013
Agreed. In this case it is possible to move to the RHS...but I have to ask
what if I need to use the math as part of a constraint. Is it not safe to
assume the divisor is 0 even if I do the check? That seems like an issue as
I do have cases which this will be required
Stephen Masters wrote
> Given that you don’t seem to using the result as a constraint, then I
> can’t see any benefit to it being on the LHS. So yes, It would be better
> on the RHS.
>
> Steve
>
>
> On 1 Nov 2013, at 17:58, Wolfgang Laun <
> wolfgang.laun@
> > wrote:
>
>> I can anticipate the answer where OP says that there is a constraint
>> restricting argVolume to > 0. However, I don't think that independent
>> constraints such as we see them in this rule are evaluated as if they
>> were in a single logical expression, with Java semantics.
>>
>> The seductive possibility of binding to a half-baked expression (i.e.,
>> $ratio:(volumeAccumulations["total"]/consolidatdVolume.avgVolume))
>> should be discarded. This value can safely be computed on the RHS
>> where the denominator's value being !=0 is asserted.
>>
>> -W
>>
>> On 01/11/2013, Stephen Masters <
> stephen.masters@
> > wrote:
>>> Divide by zero exceptions usually occur when you try to divide by zero.
>>>
>>> So … first question … is consolidatdVolume.avgVolume ever zero?
>>>
>>>
>>> On 1 Nov 2013, at 16:17, gboro54 <
> gboro54@
> > wrote:
>>>
>>>> I have rules like the following:
>>>>
>>>> rule "Add Baseline to Context if it does not exists exists or not
>>>> greater
>>>> then 0"
>>>> no-loop true
>>>> when
>>>> $context:Context($id:id,baselineParticipation==null ||
>>>>
>>>> baselineParticipation.baselineRatio==null||baselineParticipation.baselineRatio==0)
>>>> then
>>>> modify($firm) {setBaselineParticipation(new
>>>> BaselineParticipation($id,new
>>>> BigDecimal(0.00485)))};
>>>>
>>>> end
>>>>
>>>> rule "Calculate Participation Ratio"
>>>> no-loop true
>>>> when
>>>>
>>>> $context:Context(consolidatdVolume!=null,consolidatdVolume.avgVolume>0,
>>>>
>>>> volumeAccumulations["total"]!=null,volumeAccumulations["total"]>0,
>>>>
>>>> $ratio:(volumeAccumulations["total"]/consolidatdVolume.avgVolume))
>>>> then
>>>> ConcurrentMap calculatedRatios=$firm.getCalculatedRatios();
>>>> calculatedRatios.put("fparticipationRatio",new BigDecimal($ratio));
>>>> modify($firm){setCalculatedRatios(calculatedRatios)};
>>>> end
>>>>
>>>> Despite the checks I get the following exception and any insight into
>>>> why
>>>> would be great:
>>>>
>>>> Exception executing consequence for rule "Calculate Firm Participation
>>>> Ratio" in com.nasdaq.rms.nq.status: java.lang.ArithmeticException: / by
>>>> zero
>>>> Exception executing consequence for rule "Calculate Firm Participation
>>>> Ratio" in com.nasdaq.rms.nq.status: java.lang.ArithmeticException: / by
>>>> zero
>>>> at
>>>> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
>>>> at
>>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
>>>> at
>>>> org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
>>>> at
>>>> org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
>>>> at
>>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
>>>> at
>>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
>>>> at
>>>> org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
>>>> at
>>>> com.nasdaq.fq.rms.workflow.processor.rules.PerformanceStatusAssignmentProcessor.doWork(PerformanceStatusAssignmentProcessor.java:156)
>>>> at
>>>> com.ften.ssr.workqueue.WorkItemRunnable.run(WorkItemRunnable.java:48)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>>>> at java.lang.Thread.run(Thread.java:724)
>>>> Caused by: java.lang.ArithmeticException: / by zero
>>>> at ConditionEvaluatorda6271cf5a744b6bbdb9c717cae2edb7.evaluate(Unknown
>>>> Source)
>>>> at
>>>> org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:200)
>>>> at
>>>> org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)
>>>> at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:154)
>>>> at
>>>> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
>>>> at
>>>> org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:432)
>>>> at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:157)
>>>> at
>>>> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
>>>> at
>>>> org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:432)
>>>> at
>>>> org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:314)
>>>> at
>>>> org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:265)
>>>> at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:483)
>>>> at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:383)
>>>> at
>>>> org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:337)
>>>> at
>>>> com.nasdaq.rms.nq.status.Rule_Calculate_Firm_Participation_Ratio_cfb033f33c2b404fb2bff8e1b9af0175.defaultConsequence(Unknown
>>>> Source)
>>>> at
>>>> com.nasdaq.rms.nq.status.Rule_Calculate_Firm_Participation_Ratio_cfb033f33c2b404fb2bff8e1b9af0175DefaultConsequenceInvokerGenerated.evaluate(Unknown
>>>> Source)
>>>> at
>>>> com.nasdaq.rms.nq.status.Rule_Calculate_Firm_Participation_Ratio_cfb033f33c2b404fb2bff8e1b9af0175DefaultConsequenceInvoker.evaluate(Unknown
>>>> Source)
>>>> at
>>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
>>>> ... 10 more
>>>>
>>>>
>>>>
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